RDMA/bnxt_re: Fix endianness warning for req.pkey

RDMA/bnxt_re: Fix endianness warning for req.pkey

Fix the following sparse warning:

drivers/infiniband/hw/bnxt_re/qplib_fp.c:1260:26: sparse: warning: incorrect type in assignment (different base types)

Fixes: 0e938533d96d ("RDMA/bnxt_re: Remove dynamic pkey table")
Link: https://lore.kernel.org/r/20211205204537.14184-1-kamalheib1@gmail.com
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Kamal Heib <kamalheib1@gmail.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Acked-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>